GEO-ELECTRIC INVESTIGATION FOR GROUNDWATER OCCURRENCE IN OTU-OCHA AND ENVIRONS ANAMBRA EAST LOCAL GOVT, AREA, ANAMBRA STATE, NIGERIA

Author: Onuorah Paschal Obiora
Department: Geological Sciences
Affiliation: Nnamdi Azikiwe University Awka

Geo-electrical survey of Otu-ocha and Environs in Anambra East Local Government was conducted using Vertical electrical sounding (VES) method. The main objective of this study is to determine the aquifer hydraulic properties and groundwater potential of the area. The resistivity imaging measurement employing Schlumberger electrode configuration was carried out using an ABEM Terrameter SAS 300.A total number of thirteen locations were run with Vertical Electrical Sounding and several layers of geo-electric units were obtained. The interpretation of the Vertical Electrical Sounding (VES) data revealed three to five geo-electric units with depth to the aquiferous layers ranging from 21.5m to 80.9m and resistivity of the water saturated layers varying between 16.1 Ωm and 3012 Ωm. The groundwater flow pattern of the study area was found to be radial as a result of water table mound formed towards the North West. Aquifer parameters such as transmissivity and hydraulic conductivity calculated from the VES result ranges from 0.4750m2/day to 61.461 m2/day and 0.0080m/day to 1.4907m/day respectively. The average transmissivity values of SE, SW, NE, and NW were given as 0.8495 m2/day, 3.0955 m2/day, 15.6481 m2/day and 21.2587 m2/day. This supports the occurrence of watertable mound around Otu-ocha and Umueri in the NW. This result shows that the water saturation is more at the watertable mound towards the North than other areas.

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